ST-36 (Zu San Li) Leg Three Li

What does ST-36 Zu San Li do?

ST-36 Zu San Li is the He-Sea and Earth point of the Stomach channel of Foot Yang Ming, and the Lower He-Sea point of the Stomach — the point at which the classics place the Stomach's qi as it enters the deep. That double classification is why the traditional literature treats it as the principal point for harmonising the Stomach, fortifying the Spleen, and building qi and blood from the "Sea of Water and Grain". It is also recorded as a Gao Wu Command Point (governing the abdomen) and one of Ma Dan-yang's Heavenly Star points.

• Harmonises the Stomach and descends rebellious qi — the core Yang Ming action, addressed to the middle burner's downward-directing function.
• Fortifies the Spleen and resolves dampness — the Earth point of an Earth-organ channel, used where transformation and transportation are seen as weak.
• Supports the correct (zheng) qi and fosters the original (yuan) qi — its classical tonification role, and the basis of its long use with moxibustion for constitutional strengthening.
• Tonifies qi and nourishes blood and yin — because the Stomach and Spleen are held to be the postnatal source of qi and blood.
• Clears fire and calms the spirit — a less-cited action, applied to Yang Ming heat patterns presenting with agitation or mania.
• Activates the channel and alleviates pain — its local and channel role along the leg.
• Revives yang and restores consciousness — the classical emergency indication, recorded alongside collapse patterns.

Source: Sacred Lotus sources & references (channel, five-shu and command-point classifications); Deadman & Al-Khafaji, A Manual of Acupuncture, p. 158; Chinese Acupuncture & Moxibustion, p. 154; Lower He-Sea classification per Ling Shu (Spiritual Pivot), Chapter 4.

What is ST-36 Zu San Li used for?

ST-36 is used above all for digestive complaints and for deficiency of qi and blood. The indications recorded in our sources cluster into three groups: middle-burner and intestinal disorders, general depletion and fatigue, and local knee and leg problems — with a smaller set of Yang Ming heat and spirit indications.

• Gastric pain, epigastric distension and fullness
• Vomiting, hiccup and nausea
• Abdominal distension and borborygmus
• Diarrhoea, dysentery and constipation
• Indigestion and poor appetite
• Enteritis and other intestinal disorders
• Emaciation and weakness attributed to general deficiency
• Oedema attributed to failure of transformation
• Cough and asthma (as a supporting rather than primary point)
• Mastitis and breast disorders along the Stomach channel
• Aching of the knee joint and leg; beriberi
• Apoplexy and hemiplegia; dizziness
• Insomnia and mania (Yang Ming heat disturbing the spirit)

Source: Sacred Lotus sources & references; Chinese Acupuncture & Moxibustion, p. 154; Deadman & Al-Khafaji, A Manual of Acupuncture, p. 158; cross-referenced against multiple online sources.

How is ST-36 Zu San Li used in practice?

ST-36 sits below the knee on the front of the lower leg, three cun beneath the outer eye of the knee (ST-35) and one finger-breadth lateral to the front crest of the shin bone, on the belly of the tibialis anterior muscle. It is one of the most-used points in the acupuncture repertoire and appears in more standard combinations than almost any other.

• With REN-12 Zhong Wan (Hui-Meeting point of the Fu organs) — the classic pairing for Stomach disorders, joining the Lower He-Sea point of the Stomach with its front collecting point.
• With SP-06 San Yin Jiao — the standard qi-and-blood tonification pair, combining the Earth point of the Stomach channel with the meeting of the three leg yin channels.
• With REN-06 Qi Hai — used with moxibustion for depletion of original qi and post-illness fatigue.
• With BL-20 Pi Shu and BL-21 Wei Shu — front-and-back treatment of Spleen and Stomach, joining the leg point to the back transport points.
• With ST-25 Tian Shu and ST-37 Shang Ju Xu — for intestinal patterns, keeping the treatment within Yang Ming.
• With LI-04 He Gu — a general qi-regulating pairing of the two Yang Ming channels.

Among the Lower He-Sea points, ST-36 belongs to the Stomach, ST-37 Shang Ju Xu to the Large Intestine and ST-39 Xia Ju Xu to the Small Intestine — all three on the Stomach channel of the leg. Recognising that grouping is what allows a practitioner to treat the fu organs of the abdomen from below the knee. ST-36 is also the point most often chosen when moxibustion is used for long-term constitutional support, a practice recorded in both the Chinese and the Japanese moxibustion traditions.

Source: Sacred Lotus sources & references (location and point categories); Deadman & Al-Khafaji, A Manual of Acupuncture, p. 158; Chinese Acupuncture & Moxibustion, p. 154; cross-referenced against multiple online sources.

Where is ST-36 located?

• A Manual of Acupuncture (p. 158): Below the knee, 3 cun inferior to Dubi ST-35, one fingerbreadth lateral to the anterior crest of the tibia.
• Chinese Acupuncture and Moxibustion (p. 154): 3 cun below Dubi (ST-35), one finger-breadth (middle finger) from the anterior border of the tibia.

How is ST-36 Zu San Li needled in the textbooks?

Reference record only — this describes what the standard texts document, not instruction for a reader. Chinese Acupuncture & Moxibustion records perpendicular insertion of 0.5–1.2 cun at ST-36, and notes that moxibustion is applicable. Deadman & Al-Khafaji record a comparable perpendicular depth range, with deeper oblique insertion directed distally described for channel disorders of the leg.

• Angle documented: perpendicular; oblique distally in some channel applications.
• Depth documented: approximately 0.5–1.2 cun (deeper ranges appear in some modern Chinese sources).
• Moxibustion: documented as applicable, and historically one of the most common moxibustion sites on the body.

Safety reference. ST-36 lies on the muscular front of the lower leg and carries no cavity or organ hazard. The deep fibular (anterior tibial) nerve and the anterior tibial vessels run in the deep compartment beneath the point, so the texts describe the depth range as bounded rather than open-ended; needling too deeply or too laterally is documented as capable of producing a strong radiating sensation into the foot. Standard clean-needle practice applies as it does at any point. Acupuncture is performed by qualified practitioners; this record documents the literature and is not a technique guide.

Source: Chinese Acupuncture & Moxibustion, p. 154; Deadman & Al-Khafaji, A Manual of Acupuncture, p. 158; Sacred Lotus sources & references.

What does the name Zu San Li mean?

Zu San Li translates as "Leg Three Li" — zu meaning leg, and san li meaning three li, most often read as the point's measurement of three cun below the knee. A second traditional reading takes li in its sense of a village or a unit of distance and links the name to the point's reputation for restoring the strength to walk a further three li. Its counterpart on the arm, LI-10 Shou San Li ("Arm Three Li"), carries the same construction, and the two are frequently confused by name alone; they sit on different channels and have different classifications.

Why does the He-Sea and Lower He-Sea classification matter?

In five-shu theory the He-Sea point is where the channel qi is described as entering the deep, "like a river entering the sea" — which is why He-Sea points are the five-shu group associated with the fu organs and with counterflow and diarrhoea. ST-36 is the He-Sea point of the Stomach channel and also its Lower He-Sea point, and on a yang Earth channel the He-Sea point is simultaneously the Earth point, so its organ, its element and its five-shu position all agree. That triple alignment is the technical reason the tradition treats it as the Stomach's own point rather than one option among many.

Is there research on ST-36?

ST-36 is among the most-studied acupuncture points in the world, and the literature is genuinely uneven — the honest summary is that the largest evidence base concerns post-operative bowel recovery, with everything else weaker. A systematic review and meta-analysis of ST-36 acupoint injection for post-operative ileus pooled 30 trials and 2,967 participants and reported shorter times to first flatus with several injected agents, but rated every included trial at high risk of bias and judged safety inconclusive (PMID 26051583). A meta-analysis of 15 higher-quality trials of electroacupuncture or transcutaneous electroacupuncture for post-operative ileus (965 participants) reported shorter times to first flatus, defecation and oral feeding, with ST-36, ST-37 and ST-39 the preferred points, while finding no effect on post-operative pain and substantial heterogeneity throughout (PMID 31494334). A prospective randomised controlled trial in elective laparoscopic colorectal surgery examined the same question directly (PMID 35747183).

Beyond the bowel, evidence thins. A systematic review of ST-36 acupoint injection with dexamethasone for chemotherapy-induced myelosuppression exists but rests on a small and methodologically limited trial set (PMID 34295820). A broad meta-analysis of acupuncture for preventing chemotherapy-induced nausea and vomiting across 38 trials and 2,503 patients found a possible increase in complete control of acute and delayed vomiting when added to usual care, but rated the certainty of evidence low to very low — and those protocols used multiple points, not ST-36 alone (PMID 37226372). A meta-analysis of 16 task-based fMRI studies in 401 healthy volunteers reported consistent activation in the right inferior frontal operculum, left superior temporal gyrus and right median cingulate gyrus after ST-36 stimulation; this is mechanistic imaging in healthy subjects, not evidence of clinical benefit (PMID 35968313). Claims that ST-36 by itself boosts immunity, extends life or treats systemic disease are not supported by the point-specific literature.

How does ST-36 differ from nearby points?

ST-36 is regularly compared with ST-37 Shang Ju Xu and ST-39 Xia Ju Xu, which lie further down the same channel and serve the Large and Small Intestines respectively; with SP-09 Yin Ling Quan, the He-Sea point of the Spleen channel on the opposite (medial) side of the leg, which addresses dampness and water rather than qi deficiency; and with LI-10 Shou San Li, its same-named counterpart on the arm.

Source: Sacred Lotus sources & references; Deadman & Al-Khafaji, A Manual of Acupuncture, p. 158; Chinese Acupuncture & Moxibustion, p. 154; Ling Shu (Spiritual Pivot); PubMed PMID 26051583, 31494334, 35747183, 34295820, 37226372, 35968313 (each checked for retraction status before citation).